Microwave-assisted domino reactions: function-compatibility, modulation, and greening efforts
摘要:
Herein we report a microwave-assisted version of a domino protocol, providing ready access to a wide variety of complex oxygen heterocycles. The latter can be converted to stereochemically, well-defined, variously substituted carbocycles, since reaction conditions and the substitution pattern can be tailored to fit a particular type of transformation. Microwave assistance, the influence of solvent, temperature, the function compatibility, and the use of PhI(OAc)(2) as a domino promoter are investigated. (C) 2008 Elsevier Ltd. All rights reserved.
A Domino-Based Approach toward Stereodefined Heavily Functionalized Cyclohexanes: Synthesis of Iridal's Core Structure
摘要:
A stereoselective synthesis of heavily functionalized six-membered ring subunits, which possess functionality at sites appropriate for further elaboration, is described. The cyclopentanone moiety of hydrindenediol is required to achieve total facial selectivity during the pre-domino installation of the second quaternary center, while oxidative cleavage is responsible for the ring-expanding rearrangement. A microwave-assisted version of the key domino transformation and a test of concept approach toward the iridal core structure are also presented.
Enantioselective Synthesis of Iridal, the Parent Molecule of the Iridal Triterpenoid Class
作者:Andrei Corbu、Maurizio Aquino、T. V. Pratap、Pascal Retailleau、Siméon Arseniyadis
DOI:10.1021/ol8005425
日期:2008.5.1
The monocyclic triterpene iridal 1 (parent molecule) is synthesized by an approach that allows access for several representatives of the iridal family as well as diversely substituted analogues. The success of the proposed synthetic plan depends upon. the effortless stereoselective establishment of the trans C10/C11 dimethyl relationship in B-ring moiety 7 using a domino-based methodology and the higly efficient Miyaura - Suzuki type sp(3) - sp(2) segment coupling 7 and 8, respectively.