Enantioselective Total Synthesis of the (−)-(6R,11R,14S)-Isomer of Colletallol
摘要:
The total synthesis of the (-)-(6R,11R,14S)-isomer of colletallol was achieved in 15 steps. The key steps of the sequence were the building of the macrocycle via two consecutive Wittig reactions, the first intermolecular and the second intramolecular, instead of the classical macrolactonization methods.
We completed a new and efficient synthesis of D-chalcose (I) and the first synthesis of its C-3 epimer (I') in nine steps with overall yields of 23% and 24%, respectively. The key steps in the sequence were the formation of the stereocenter on C3 via Grignard reaction, the introduction of the stereogenic center on C2 by Sharpless asymmetric dihydroxylation, the protection of the C1 and C2 hydroxy groups
Snider; Shi, Journal of the American Chemical Society, 1994, vol. 116, # 2, p. 549 - 557
作者:Snider、Shi
DOI:——
日期:——
The furan approach to oxacycles. Part 4: A synthesis of (+)-decarestrictine L
作者:Isela García、Generosa Gómez、Marta Teijeira、Carmen Terán、Yagamare Fall
DOI:10.1016/j.tetlet.2005.12.055
日期:2006.2
We describe an efficient new approach for the enantioselective synthesis of (+)-(2R,3S,6R)-decarestrictine L from commercially available starting material using our newly developed methodology based oil the oxidation of a furan ring with singlet oxygen followed by an intramolecular hetero Michael addition. (c) 2005 Elsevier Ltd. All rights reserved.