作者:Meng-Yang Chang、Nein-Chen Chang、Chung-Yi Chen、Min-Ruey Tasi、Tze-Wei Tseng
DOI:10.1055/s-2004-816001
日期:——
Carbon skeleton of polysubstituted pyroglutamates with three contiguous asymmetric centers was built up in one base-induced coupling/cyclization reaction of α-sulfonylacetamide with 2-bromo-2-propenoates. A simple transformation to 3-substituted prolinols can be easily achieved via reduction and desulfonation. A ring expansion of prolinol has been used as the key step in the formal synthesis of isoguvacine and paroxetine. The one-pot conversion of 3-substituted prolinol to the 3-substituted pyroglutamic acid is also reported.
在一次α-磺酰基乙酰胺与2-溴-2-丙烯酸酯的碱诱导偶联/环化反应中,构建了含有三个连续不对称中心的取代焦谷氨酸盐的碳骨架。通过还原和脱磺化,可以轻松实现向3-取代的脯氨醇的简单转化。脯氨醇的环扩张已被用作异古瓦辛和帕罗西汀的形式合成的关键步骤。还报道了3-取代脯氨醇向3-取代焦谷氨酸的一锅法转化。