Convergent, Stereoselective Synthesis of the GHIJ Fragment of Brevetoxin A
摘要:
A stereoselective synthesis of the GHIJ fragment of brevetoxin A utilizing a convergent assembly strategy is described. Glycolate alkylation, ring-closing metathesis, and Hosomi-Sakurai reactions were central operations in the construction of the G ring and J ring subunits, which were united through a Horner-Wadsworth-Emmons coupling. Subsequent dehydrative cyclization produced an endocyclic enol ether that was further elaborated to the tetracyclic GHIJ fragment of brevetoxin A.
Convergent, Stereoselective Synthesis of the GHIJ Fragment of Brevetoxin A
摘要:
A stereoselective synthesis of the GHIJ fragment of brevetoxin A utilizing a convergent assembly strategy is described. Glycolate alkylation, ring-closing metathesis, and Hosomi-Sakurai reactions were central operations in the construction of the G ring and J ring subunits, which were united through a Horner-Wadsworth-Emmons coupling. Subsequent dehydrative cyclization produced an endocyclic enol ether that was further elaborated to the tetracyclic GHIJ fragment of brevetoxin A.
Enantioselective Total Synthesis of Brevetoxin A: Convergent Coupling Strategy and Completion
作者:Michael T. Crimmins、J. Lucas Zuccarello、Patrick J. McDougall、J. Michael Ellis
DOI:10.1002/chem.200900777
日期:2009.9.14
A highly convergent, enantioselective totalsynthesis of brevetoxin A is reported. The development of a [X+2+X] Horner–Wadsworth–Emmons/cyclodehydration/reductive etherification convergent couplingstrategy allowed a unified approach to the synthesis of two advanced tetracyclic fragments from four cyclic ether subunits. The Horner–Wittig coupling of the two tetracyclic fragments provided substrates