Practical synthesis of a highly functionalized thiazole ketone
摘要:
Compound 1 is a uniquely substituted ketone prepared via addition of a thiazole anion to an aromatic nitrile in good overall yield. An exploration into the generality of the addition of thiazole anions to nitriles allowed us to make a variety of thiazole ketones in good to excellent yields. The non-odorous thiolate-mediated demethylation reaction used in the synthesis of 1 is also presented. (C) 2003 Elsevier Ltd. All rights reserved.
Highly Enantioselective Hydrogenation of Aromatic-Heteroaromatic Ketones
作者:Cheng-yi Chen、Robert A. Reamer、Jennifer R. Chilenski、Chris J. McWilliams
DOI:10.1021/ol0360795
日期:2003.12.1
Asymmetric hydrogenation of ketone 1 using trans-RuCl(2)[(R)-xylbinap][(R)-daipen] (3) as a catalyst afforded secondary alcohol 2 quantitatively and in 99.4% ee. Further exploration of the effect of the thiazole ring substitution revealed that the catalyst was highly effective for the enantioselectivehydrogenation of 5-benzoyl thiazoles, which afforded corresponding alcohols in 92-99% ee. The same