Practical Syntheses of Both Enantiomers of Cyclopropylglycine and of Methyl 2-Cyclopropyl-2-N-Boc-iminoacetate
作者:Oleg V. Larionov、Armin de Meijere
DOI:10.1002/adsc.200606038
日期:2006.6
cyclopropyl methyl ketone has been elaborated. Enzymatic hydrolysis of the N-Boc-protected methyl ester of cyclopropylglycine 9 with the inexpensive enzyme papain from Carica papaya affords both enantiomers of cyclopropylglycine (8) with enantiomeric excesses of 99 % or better after deprotection under acidic conditions. Furthermore, the new cyclopropyl group-containing building block methyl 2-cyclopr
已详细说明了从便宜的环丙基甲基酮轻松合成三克外消旋环丙基甘氨酸的方法。用来自番木瓜的廉价木瓜蛋白酶酶解环丙基甘氨酸9的N -Boc保护的甲酯,在酸性条件下脱保护后,提供环丙基甘氨酸(8)的两种对映异构体,其对映体过量为99%或更高。此外,通过N制备新的含环丙基基团的2-环丙基-2- N -Boc-亚氨基乙酸甲酯(13)1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)进行氯化-氯化反应,然后进行脱氯化氢反应。向13个亲核试剂中添加亲核试剂可方便地获得不寻常的,正交双保护的α,α-二氨基酸衍生物和刚性肽骨架的有趣组分。