An Expeditious Synthesis of (±)-Desepoxy-4,5-didehydromethylenomycin A Methyl Ester
作者:Piotr Balczewski、Marian Mikolajczyk
DOI:10.1021/ol005742b
日期:2000.4.1
[formula: see text] A total synthesis of the racemic methyl ester of desepoxy-4,5-didehydromethylenomycin A has been achieved in six steps with an overall yield of 31% starting from diethyl methanephosphonate. The key steps include the Nazarov cyclization of the dienone 7 leading to the alpha-phosphoryl cyclopentenone 8 and the Horner-Wittig reaction of the latter employed for the introduction of the
六步合成了脱环氧-4,5-didehydromethylenomycin A的外消旋甲酯的全合成,从甲烷膦酸二乙酯开始,总收率为31%。关键步骤包括二烯酮7的纳扎罗夫环化反应,产生α-磷酰基环戊烯酮8,后者的霍纳-维蒂希反应用于引入环外亚甲基部分。