A Sulfone-Based Strategy for the Preparation of 2,4-Disubstituted Furan Derivatives
作者:Nathan R. Haines、Aaron N. VanZanten、Anthony A. Cuneo、John R. Miller、William J. Andrews、David A. Carlson、Ryan M. Harrington、Adam M. Kiefer、Jeremy D. Mason、Julie A. Pigza、S. Shaun Murphree
DOI:10.1021/jo201529s
日期:2011.10.7
3-dibromo-1-phenylsulfonyl-1-propene (DBP, 2) with 1,3-diketones under basic conditions. The furan-forming step involves a deacetylation, and the selectivity of this process depends upon the steric demand of the R group. The substituent in position 4 is elaborated by reaction of sulfonyl carbanions with alkyl halides, acyl halides, and aldehydes. Oxidative or reductive desulfonylation produces the 2,4-disubstituted
通过在碱性条件下用1,3-二酮处理2,3-二溴-1-苯基磺酰基-1-丙烯(DBP,2)来制备2,4-二取代的呋喃。呋喃形成步骤涉及脱乙酰基,并且该过程的选择性取决于R基团的空间需求。通过磺酰基碳负离子与烷基卤化物,酰基卤化物和醛的反应来精制4位上的取代基。氧化或还原性磺酰化可产生2,4-二取代的呋喃,产率为60-92%。此策略已用于制备rabdoketone A(12)和天然存在的线毒糠酸13。