作者:Marco Lumini、Franca M. Cordero、Federica Pisaneschi、Alberto Brandi
DOI:10.1002/ejoc.200800044
日期:2008.6
The synthesis of several α-substituted N-Boc-protected prolines has been achieved by cross metathesis (CM) of N-Boc-allylproline 5 with terminal long chain alkenes and alkenes bearing hydroxy, silyloxy, ester, and O-acetylglucosamido groups. The CM occurred with good selectivity and short reaction time under microwave heating conditions, affording yields in the range of 40–92 %. Addition of Ti(OiPr)4
通过 N-Boc-烯丙基脯氨酸 5 与末端长链烯烃和带有羟基、甲硅烷氧基、酯和 O-乙酰氨基葡糖基团的烯烃的交叉复分解 (CM),合成了几种 α-取代的 N-Boc 保护的脯氨酸。在微波加热条件下,CM 具有良好的选择性和较短的反应时间,产率范围为 40-92%。在具有路易斯碱性取代基的烯烃的情况下,添加作为路易斯酸的 Ti(OiPr) 4 允许略微增加产率。CM 也成功地应用于用三氯乙醛 4 保护的烯丙基脯氨酸,但中间产物对于进一步脱保护和加工不太实用。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)