Regio- and Stereoselective Opening of Oxiranes through Neighbouring Group Participation: Stereocontrolled Synthesis of Enantiopure Hydroxylated Oxazolidin-2-ones
作者:Nicole Langlois、Alberto Moro
DOI:10.1002/(sici)1099-0690(199912)1999:12<3483::aid-ejoc3483>3.0.co;2-e
日期:1999.12
The regio- and stereo-selective ring opening of (S)-pyroglutaminol derived epoxides provides an effective route to protected syn,syn-aminodiol units. The procedure involves the chemoselective aminolysis or alcoholysis of (3R,4R,5R)-N-(tert-butoxycarbonyl)-3,4-epoxy-5-[(1-ethoxy)ethoxymethyl]pyrrolidin-2-one (10), followed by the formation in quantitative yield of oxazolidinone intermediates, through
(S)-焦谷氨酰胺衍生的环氧化物的区域和立体选择性开环提供了保护受保护的顺式,顺式-氨基二醇单元的有效途径。该程序涉及(3 R,4 R,5 R)-N-(叔丁氧羰基)-3,4-环氧-5-[(1-乙氧基)乙氧基甲基]吡咯烷丁2-(10),然后通过邻近的N- Boc基团的介导,以定量产率形成恶唑烷酮中间体。(3 R,4 S,5 R)-3,4-二乙酰氧基-5-(乙酰氧基甲基)吡咯烷酮-2-酮应在进一步的合成中用作有用的结构单元。