Diastereoselective and Enantioselective Henry (Nitroaldol) Reaction Utilizing a Guanidine-Thiourea Bifunctional Organocatalyst
作者:Yoshihiro Sohtome、Yuichi Hashimoto、Kazuo Nagasawa
DOI:10.1002/ejoc.200600307
日期:2006.7
diastereoselective Henry reaction of various aldehydes with nitroethane was developed using the guanidine-thiourea bifunctional catalyst 1 (syn selectivity of 86:14 to 99:1 with 84–99 % ee). A variety of nitroalkanes was treated with unbranched and branched aldehydes and gave nitro alcohols with high syn diastereoselectivities (90:10 to 99:1) and high enantioselectivities (85–95 % ee). This reaction was successfully
使用胍-硫脲双功能催化剂 1(同步选择性为 86:14 至 99:1,ee 为 84-99%)开发了各种醛与硝基乙烷的高度对映选择性和非对映选择性亨利反应。各种硝基烷烃用直链和支链醛处理,得到具有高顺式非对映选择性(90:10 至 99:1)和高对映选择性(85-95% ee)的硝基醇。该反应成功用于 (4S,5R)-epi-cytoxazone 的直接合成。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)