Unusual removal of the ethylene ketal protection from 2,3-dichloro-4,4-ethylenedioxycyclopent-2-en-1-one under alkaline conditions. Simple synthesis of naturally occurring cyclopentenedione analogs
作者:F. A. Gimalova、V. A. Egorov、N. A. Ivanova、A. A. Fatykhov、M. S. Miftakhov
DOI:10.1007/s11172-009-0103-6
日期:2009.4
CH2N2 has been converted to the corresponding enol ether. This methodology has been used for the synthesis of 4-chloro-5-methoxy-2-cinnamylidenecyclopent-4-en-1,3-diones and related compounds starting from the parent dichlorocyclopentenone.
已经研究了 2,3-二氯-4,4-亚乙基二氧基环戊-2-en-1-one 与 MeONa 在 MeOH 中的反应,以提供 2-氯-3-羟基环戊-2-en-1,4-二酮。后者在 CH2N2 作用下已转化为相应的烯醇醚。该方法已用于从母体二氯环戊烯酮开始合成 4-氯-5-甲氧基-2-肉桂基环戊-4-en-1,3-二酮和相关化合物。