A Three-Step Catalytic Asymmetric Sequence from Alkynes to α-Silyloxyaldehydes and Its Application to a C22–C41 Fragment of Bastimolide A
作者:Jacob N. Hackbarth、Gregory K. Friestad
DOI:10.1021/acs.orglett.4c01310
日期:2024.5.31
1,5-Polyol structures present challenges in stereocontrol, configurational assignment, and diastereomer separation; these are all compromised by remote stereochemical relationships. A configuration-encoded approach with alcohol configurations previously established within enantiopure building blocks offers a versatile solution to these issues. The iterative construction begins with α-silyloxyaldehydes;
Versatile Configuration-Encoded Strategy for Rapid Synthesis of 1,5-Polyol Stereoisomers
作者:Gregory K. Friestad、Gopeekrishnan Sreenilayam
DOI:10.1021/ol1021417
日期:2010.11.5
The isolated stereogenic centers of 1,5-polyol-containing natural products present challenges to synthesis and structure determination. To address this problem, a configuration-encoded strategy defines each configuration within a simple 4-(arylsulfonyl)butyronitrile building block, a repeat unit that is reliably and efficiently coupled in iterative fashion to afford 1,5-polyols of defined stereochemistry. For example, the C27-C40 subunit of tetrafibricin is prepared in five steps and 42% yield. This strategy is amenable to rapid and unambiguous preparation of all configurational permutations of 1,5-polyols with equal facility.