A Novel Three-Carbon Ring Expansion Sequence Synthesis of<i>Exaltone</i>® and (±)-Muscone
作者:Charles Fehr
DOI:10.1002/hlca.19830660816
日期:1983.12.14
Intramolecular Grignard-type reaction of the bromo lactones 3 and 8 affords the macrocycles 10, 11, 12 and 13, 14, 15, respectively. More efficiently, 10 and 13 are obtained by intramolecular nucleophilic attack of the carbanions derived from the sulfonyl lactones 20 and 22 and in situ reduction of the intermediate sulfones 21 and 23. The macrocylic hydroxy ketones 10 and 13 are converted into Exaltone®
溴内酯3和8的分子内格利雅型反应分别提供大环10、11、12和13、14、15。更有效地,10和13由来自磺酰内酯衍生的碳阴离子的分子内亲核进攻而获得20和22和原位还原中间体砜的21和23的大环羟基酮10和13被转换成Exaltone ® (2)和muscone(1)。