Platinum-Catalyzed Tandem Diboration/Intramolecular Allylboration: Diastereoselective Access to Cyclohexanes Bearing 1,3-Diols
作者:James P. Morken、C. Eric Ballard
DOI:10.1055/s-2004-822379
日期:——
A tandem reaction sequence consisting of platinum-catalyzed diboration of 1,3-dienes followed by intramolecularallylboration and oxidative hydrolysis has been developed for constructing cyclic structures that bear a 1,3-diol. This methodology has proven effective for synthesizing cyclohexanes from dienals in good yields (44-64%) to generate diols containing two new vicinal stereocenters, one of which
Enantioselective Synthesis of Bridged Bicyclic Ring Systems
作者:John A. Brailsford、Liang Zhu、Mandy Loo、Kenneth J. Shea
DOI:10.1021/jo701964b
日期:2007.11.1
bicyclo[5.3.1]undecane and bicyclo[4.3.1]decane ringsystems. These structures are common to a number of biologically important natural products. Asymmetric variants of the type 2 IMDA reaction incorporating oxazolidinone chiral auxiliaries have been evaluated. This study has resulted in systems that deliver bridged bicyclic [5.3.1] and [4.3.1] ringsystems in high diastereomeric (97−99% de) and enantiomeric