New Stereodivergent Approach to 3-Amino-2,3,6-trideoxysugars. Enantioselective Synthesis of Daunosamine, Ristosamine, Acosamine, and Epi-daunosamine
作者:Xavier Ginesta、Mireia Pastó、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/ol034843h
日期:2003.8.1
[reaction: see text] An enantioselective preparation of the four diastereomeric 3-amino-2,3,6-trideoxy-hexoses, key components of anthracycline antibiotics, has been developed. Sharpless catalytic asymmetric epoxidation of the (2E)-2,5-hexadien-1-ol, regioselective ring opening with azide, followed by convenient functional group transformations, afforded the key aldehydes cis- or trans-6 in any configuration
[反应:见正文]已经开发了蒽环类抗生素关键成分的四种非对映异构体3-氨基-2,3,6-三苯氧基-己糖的对映选择性制剂。(2E)-2,5-己二-1-醇的无尖锐催化不对称环氧化,与叠氮化物的区域选择性开环,然后进行方便的官能团转化,可提供任何构型的关键醛顺式或反式-6。向这些醛中非对映选择性地添加甲基金属试剂,然后进行臭氧分解,从而以完全立体受控的方式获得了四种异构体三脱氧氨基糖。