Synthesis of Indan-Based Unusual α-Amino Acid Derivatives under Phase-Transfer Catalysis Conditions
作者:Sambasivarao Kotha、Enugurthi Brahmachary
DOI:10.1021/jo991387v
日期:2000.3.1
Conformationally constrained cyclic alpha-amino acid derivatives were synthesized under solid-liquid phase-transfer catalysis conditions. This methodology involves the bis-alkylation of ethyl isocyanoacetate with various alpha,alpha'-dibromo-o-xylene derivatives [alpha,alpha'-dibromo-o-xylene 5, 2,3-bis(bromomethyl)-1, 4-dimethoxybenzene 6, 1,2-bis(bromomethyl)-4,5-dibromobenzene 7, 2, 3-bis(bromomethyl)naphthalene
在固液相转移催化条件下合成了构象受限的环状α-氨基酸衍生物。该方法学涉及将异氰基乙酸乙酯与各种α,α'-二溴邻二甲苯衍生物[α,α'-二溴邻二甲苯5,5,2,3-双(溴甲基)-1,4-二甲氧基苯的双烷基化。 6,1,2-双(溴甲基)-4,5-二溴苯7,2,3-双(溴甲基)萘8,1,8-双(溴甲基)萘9,6,7-双(溴甲基)- 2,2-二甲基-1H-苯并-1,3(2H)-二酮10,2,3-双(溴甲基)-1,4-蒽醌11,6,7,7-双(溴甲基)喹喔啉12,3,4 -双(溴甲基)呋喃13,1,2,4,5-四(溴甲基)苯28,和六(溴甲基)苯30],以碳酸钾为碱,硫酸四丁铵硫酸盐为相转移催化剂,得到相应的异腈衍生物,将其在乙醇中用HCl水解后得到氨基酯。使用这种方法,制备了电子不足的以及富电子的和卤素取代的基于茚满的α-氨基酸。还描述了双茚满以及三茚满α-氨基酯的制备。