<i>N</i>-Methoxy-<i>N</i>-acylnitrenium Ions: Application to the Formal Synthesis of (−)-TAN1251A
作者:Duncan J. Wardrop、Arindrajit Basak
DOI:10.1021/ol015626o
日期:2001.4.1
[structure: see text]. A formal synthesis of the muscarinic M(1) receptor antagonist (-)-TAN1251A (7) from L-tyrosine is described. Central to this venture has been the construction of the 1-azaspiro[4.5]decane skeleton present in the natural product by an N-methoxy-N-acylnitrenium ion-induced spirocyclization. The dienone generated in this transformation, 10, was converted to (-)-TAN1251A via tricycle
[结构:见文字]。从L-酪氨酸的毒蕈碱M(1)受体拮抗剂(-)-TAN1251A(7)的正式合成进行了描述。该项目的核心是通过N-甲氧基-N-酰基亚硝酸根离子诱导的螺环化作用,在天然产物中构建1-azaspiro [4.5]癸烷骨架。该转化产生的二烯酮10通过三轮车9转化为(-)-TAN1251A,这是川原最近合成外消旋7的中间体。