Thiazoles and Benzothiazoles as Bioisosteres

Another recent example where a thiazole was introduced as an isosteric replacement for a pyrazole was reported by medicinal chemists at AstraZeneca. Compound AZ960 with IC50 3 nM had been identified as 

2 The compound 2-lithiothiazole like 2-(trimethylsilyl)thiazole (2-TST) has been used as a formyl anion equivalent used by Dondoni in the scheme below to prepare a chiral compound by a process called aminohomolgation of Gamer aldehyde. Propose stmctures for products A, B, C, and D below.  

5 Predict the structure of product I from the following reaction. 

7 Propose a reasonable mechanism for the formation of the following 2-aminbenzothiazole.  

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