Synthesis of compound 8

C35H34O5 M = 534.64 g.mol^“

Mass: (ESI ): 535.00 (M + H); 552.00 (M + H₂0); 785.87; 1086.67 (2M + H₂0)

A.

Procedure A:

To a solution of 4 (10.5g, 15.89mmol, leq) in toluene (400mL) were added 18-crown-6 (168mg, 0.64mmol, 0.04eq) and potassium carbonate (6.69g, 48.5mmol, 3.05eq.). The mixture was stirred overnight at room temperature, and then the remising insoluble material was filtered off and washed with toluene. The filtrate and the washings were combined, washed with 2N hydrochloric acid aqueous solution followed by saturated sodium hydrogencarbonate aqueous solution, dried over sodium sulphate, filtered and concentrated under reduced pressure. The residue was purified on silica gel chromatography (cyclohexane/ethyl acetate 98:2 to 80:20) to afford cyclohexenone 8 (4.07g; 48% yield) as yellowish oil.

Procedure B:

A solution of 7 (3.27g, 5.92mmol, leq) in pyridine (14mL) was cooled to 0°C before POCl₃ (2.75mL, 29.6mmol, 5eq) was added dropwise. The mixture was stirred at this temperature for 10 min before the cooling bath was removed. The reaction mixture was stirred overnight at room temperature before being re-cooled to 0°C. POCI3 (2.75mL, 29.6mmol, 5eq) was added once again trying to complete the reaction. The mixture was stirred for an additional 20h at room temperature before being diluted with Et₂0 (20mL) and poured onto crushed ice. 1M HC1 aqueous solution (lOOmL) was added, and the mixture was extracted with Et₂0 (200mL & l OOmL). The combined organic extracts were washed with brine (lOOmL), dried over sodium sulphate, filtered and concentrated before being purified on silica gel chromatography (cyclohexane / ethyl acetate 98:2 to 80:20) to afford compound 8 (1.46g, 46% yield) as an orange oil. Synthesis of compound 9

C₁₅H₁₂BrC10₂ M = 339.61 g.moF¹

Mass: (GC-MS): 338-340

The synthesis of this product is described in J. Med. Chem. 2008, 51, 1 145—1149.Synthesis of compound 10

C15H14B1CIO M = 325.63 g.mof¹

10 The synthesis of this product is described in J. Med. Chem. 2008, 51, 1145-1 149.

Synthesis of compound 11

C50H49CIO6 M = 781.37 g.moF¹

Mass: ESI⁺): 798.20 (M + H₂0)

Under inert atmosphere, Mg powder (265mg, 10.9mmol, 2.4eq) was charged into a three necked flask, followed by addition of a portion of 1/3 of a solution of the 4- bromo-l-chloro-2-(4-ethylbenzyl)benzene (2.95g, 9.1mmol; 2eq) in dry THF (25mL) and 1 ,2-dibromoethane (10 mol % of Mg; 85mg; 0.45mmol). The mixture was heated to reflux. After the reaction was initiated (exothermic and consuming of Mg), the remaining solution of 2-(4-ethylbenzyl)-4-bromo-l-chlorobenzene in dry TFIF was added dropwise. The mixture was then allowed to react for another one hour under gentle reflux until most of the Mg was consumed.

The above Grignard reagent was added dropwise into the solution of cyclohexenone 8 (2.42g, 4.53mmol, leq) in dry THF (25mL) under inert atmosphere at room temperature (about 25°C), then allowed to react for 3h. A saturated aqueous solution of ammonium chloride was added into the mixture to quench the reaction. The mixture was extracted with Et₂0, washed with brine, dried over sodium sulphate, filtered and concentrated. The residue was purified on silica gel chromatography (cyclohexane/ethyl acetate 100:0 to 80:20) to afford the target compound 11 as a yellow oil (3.01g, 86%).

Synthesis of compound 12

C₅oH49C10₅ M = 765.37 g.mol^“1

+): 782.13 (M + H₂0)

Triethylsilane (0.210mL, 1.30mmol, 3eq) and boron-trifluoride etherate (48% BF₃, O. l lOmL, 0.866mmol, 2eq) were successively added into a solution of alcohol 1 1 (338mg, 0.433mmol, leq) in dichloromethane (5mL) under inert atmosphere at -20°C. After stirring for 2.5h, a saturated aqueous solution of sodium chloride was added to quench the reaction. The mixture was extracted with CH₂C1₂ (10mLx3) and the organic layer was washed with brine, dried over Na₂S0₄, filtrated and concentrated. The residue was purified on silica gel chromatography (cyclohexane/ethyl acetate 9.8:0.2 to 8:2) to afford the target compound 12 as a white powder (278 mg, 0.363mmol, 84%).

Synthesis of compound 13

C₅oH_5tC10₆ M = 783.39g.moF¹

Mass: (ESI⁺): 800 (M + H₂0); 1581 (2M + H₂0)

Under inert atmosphere, borane-dimethyl sulfide complex (2M in THF, 16.7mL, 33mmol, 10.5eq) was added to a solution of 12 (2.41g; 3.15mmol, leq) in dry THF (lOOmL) cooled to 0°C. The reaction mixture was then refluxed for lh,cooled to 0°C and treated carefully with sodium hydroxide (3M in H₂0, 10.5mL, 31.5mmol, lOeq), followed by hydrogen peroxide (30% in H₂0, 3.2mL, 31.5mmol, l Oeq) at room temperature (above 30°C). The mixture was allowed to react overnight at room temperature (~25°C) before a saturated aqueous solution of ammonium chloride was added to quench the reaction. The mixture was extracted with ethyl acetate and the organic layer was washed with brine, dried over Na₂S0₄, filtered, and concentrated. The residue was purified by silica gel chromatography (cyclohexane/ethyl acetate 97:3 to 73:27) to afford the desired compound 13 (1.05g; 43%) as a yellowish oil.

Synthesis of compound 14

C50H49CIO6 M = 781.37g.mol^“1

Mass: (ESI⁺): 798 (M + H₂0); 1471; 1579 (2M + H₂0)

13 14

Dess-Martin periodinane (81mg; 1.91mmol; 1.5eq) was added portion wise to a solution of alcohol 13 (l .Og; 1.28mmol, leq) in anhydrous dichloromethane (20mL) at 0°C. The reaction was then stirred overnight at room temperature before being quenched with IN aqueous solution of sodium hydroxide. The organic layer was separated and the aqueous layer was extracted with dichloromethane. The combined organic layers were dried over sodium sulphate, filtered and concentrated. The residue was purified on silica gel chromatography (cyclohexane / ethyl acetate 98:2 to 82: 18), to afford the target ketone 14 (783mg, 79% yield) as a colorless oil. Synthesis of compound 15

C₅oH49ClF₂0₆ M = 803.37g.moF¹

¹⁹ F NMR (CDCU, 282.5MHz): -100.3 (d, J=254Hz, IF, CFF); -1 13.3 (td, Jl=254Hz, J2=29Hz, IF, CFF).

Mass: (ESI⁺): 820.00 (M+H₂0)

14 15

A solution of ketone 14 (421mg, 0.539mmol, leq) in DAST (2mL, 16.3mmol, 30eq.) was stirred under inert atmosphere at 70°C for 12h. The mixture was then cooled to room temperature and dichloromethane was added. The solution was poured on a mixture of water, ice and solid NaHC0₃. Agitation was maintained for 30min while reaching room temperature. The aqueous layer was extracted with dichloromethane and the organic phase was dried over Na₂S0₄, filtered and concentrated. The crude product was purified on silica gel chromatography (cyclohexane/ethyl acetate 98:2 to 80:20) to afford the desired compound 15 as a yellowish oil ( 182mg, 42% yield).

Synthesis of compound 16

C22H25CIF2O5 M = 442.88g.mor¹

¹⁹ F NMR (MeOD, 282.5MHz): -96.7 (d, J=254Hz, IF, CFF); 12.2 (td,

Jl=254Hz, J2=28Hz, IF, CFF).

Mass: (ESI⁺): 465.3 (M+Na)

o-Dichlorobenzene (0.320mL, 2.82mol, lOeq) followed by Pd/C 10% (0.342g, 0.32mol, l .leq) were added to a solution of 15 (228mg, 0.28mmol, leq) in a mixture of THF and MeOH (2: 1, v/v, 160mL). The reaction was placed under hydrogen atmosphere and stirred at room temperature for 2h. The reaction mixture was filtered and concentrated before being purified on silica gel chromatography (dichloromethane/methanol 100: 1 to 90: 10) to afford compound 16 (105mg, 83% yield).

Vancouver, British Columbia – December 7, 2012 – Sirona Biochem Corp. (TSX-V: SBM), announced its sodium glucose transporter (SGLT) inhibitor for Type 2 diabetes reduced blood glucose more effectively than Johnson and Johnson’s canagliflozin, an advanced SGLT inhibitor being considered for market approval in Europe and the U.S.  Studies compared Sirona Biochem’s SGLT Inhibitor, SBM-TFC-039, with canagliflozin and were conducted on Zucker Diabetic Fatty (ZDF) rats.

In the study, SBM-TFC-039 significantly and rapidly reduced blood glucose levels at a dose of 1.0 mg/kg.  Six (6) hours after administration, SBM-TFC-039 reduced blood glucose by 44% compared to canagliflozin at 26%.  SBM-TFC-039 also had a longer duration of effect than canagliflozin.  At 36 and 48 hours after treatment, SBM-TFC-039, at a dose of 1.0 mg/kg, was still effective at reducing blood glucose, whereas canagliflozin lost its effect after 36 hours.  Studies were conducted at the Institut Universitaire de Cardiologie et de Pneumologie de Québec (IUCPQ) by Principal Investigator Dr. Denis Richard, Research Chair on Obesity and Professor, Faculty of Medicine, Department of Anatomy & Physiology at Laval University.

“SGLT Inhibitors are a ground-breaking new treatment for Type 2 diabetes and these results demonstrate that SBM-TFC-039 will be a significant competitor for other SGLT Inhibitors,” said Neil Belenkie, Chief Executive Officer of Sirona Biochem. “The first SGLT Inhibitor,Forxiga™, was approved last month by the European Commission.  We believe there is tremendous market potential worldwide for SGLT Inhibitors in the treatment of diabetes.”

SBM-TFC-039 is a sodium glucose transporter (SGLT) inhibitor.  SGLT inhibitors are a new class of drug candidates for the treatment of diabetes. In the kidneys, SGLT inhibitors reduce the reabsorption of glucose into the bloodstream by eliminating excess glucose into the urine.

About Sirona Biochem Corp.
Sirona Biochem is a biotechnology company developing diabetes therapeutics, skin depigmenting and anti-aging agents for cosmetic use, biological ingredients and cancer vaccine antigens.  The company utilizes a proprietary chemistry technique to improve pharmaceutical properties of carbohydrate-based molecules. For more information visit www.sironabiochem.com.

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