One-Pot Enantioselective Synthesis of Tryptophan Derivatives via Phase-Transfer Catalytic Alkylation of Glycine Using a Cinchona-Derived Catalyst
作者:M. Hossain、Robert Todd、Matthew Huisman、Nazim Uddin、Sarah Oehm
DOI:10.1055/s-0032-1317382
日期:——
paper describes the enantiospecific synthesis of ring-A substituted tryptophan derivatives from commercially available gramines using chiral phase-transfer conditions. This one-pot reaction avoids protecting/deprotecting the indolylic nitrogen of gramine by choosing a chemoselective quaternization reagent, 4-(trifluoro-methoxy)benzyl bromide, to produce an electrophilic salt intermediate, which is subsequently
色氨酸是许多天然产品的基石。本文描述了使用手性相转移条件从市售的禾本科植物中合成环 A 取代的色氨酸衍生物。这种一锅反应通过选择化学选择性季铵化试剂 4-(三氟甲氧基)苄基溴来避免保护/去保护禾本科植物的吲哚氮,以产生亲电盐中间体,随后以高对映体过量的高产率烷基化。