A New α,β-Enone → Alkynone Fragmentation. Syntheses of exaltone® and (±)-muscone
作者:Charles Fehr、Günther Ohloff、George Büchi
DOI:10.1002/hlca.19790620815
日期:1979.12.12
p-Toluenesulfonylhydrazones of α, β-unsaturated ketones undergo an alkynone fragmentation in high yield when treated with electrophiles under basic conditions. With N-bromosuccinimide in alcohols, the p-tosylhydrazones 4a and 4b yielded in a one-pot reaction the cyclic 4-alkyn-1-ones 5a and 5b; these were converted to Exaltone® (1a) and muscone (1b) on catalytic hydrogenation.
p α的-Toluenesulfonylhydrazones,当在碱性条件下的亲电子处理β不饱和酮进行高收率的炔酮碎片。随着醇N-溴代琥珀酰亚胺,所述p -tosylhydrazones图4a和图4b中一个单釜反应中的环状4-炔-1-酮,得到图5A和5B ; 在催化氢化作用下将它们转化为(1a)和麝香酮(1b)。