Synthesis 2021; 53(17): 3110-3120
DOI: 10.1055/a-1485-5781
special topic
Bond Activation – in Honor of Prof. Shinji Murai

Reconstruction of Carbon Bond Frameworks via Oxapalladacycles Promoted by the Synergistic Effect of Palladium Catalyst and Triethylborane

Ryo Ninokata
,
Riho Korogi
,
Junya Nakao
,
Tsutomu Fukuda
,
Gen Onodera
,
This work was supported by a Grant-in-Aid for Scientific Research (B) (JP18H01981) from the Japan Society for the Promotion of Science (JSPS) and partly by a Grant-in-Aid for Scientific Research on Innovative Areas, ‘Precise Formation of a Catalyst Having a Specified Field for Use in Extremely Difficult Substrate Conversion Reactions’ (No. JP18H04266) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT).


Abstract

Pd-catalyzed β-carbon elimination of 3-hydroxy-4-pent­enoic acid derivatives promoted by triethylborane proceeds to form conjugated dienes via a decarboxylation process. The formed conjugated dienes undergo the Prins reaction with aldehydes in situ to afford conjugated homoallylic alcohols. These sequential transformations enable the conversion of diastereomeric mixtures of 3-hydroxy-4-pentenoic acids, which are readily prepared from the simple crossed aldol reaction of esters and α,β-unsaturated aldehydes, into 3,5-hexadienyl alcohols with high regio- and stereoselectivities in a single manipulation.

Supporting Information



Publication History

Received: 13 March 2021

Accepted after revision: 19 April 2021

Accepted Manuscript online:
19 April 2021

Article published online:
19 May 2021

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