Synthesis 2019; 51(09): 1935-1948
DOI: 10.1055/s-0037-1611709
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© Georg Thieme Verlag Stuttgart · New York

Asymmetric Kulinkovich Hydroxycyclopropanation of Alkenes Mediated by Titanium(IV) TADDOLate Complexes

Marharyta Iskryk
a   Tallinn University of Technology, School of Science, Department of Chemistry and Biotechnology, Akadeemia tee 15, 12618 Tallinn, Estonia   Email: dzmitry.kananovich@taltech.ee
b   Laboratory of Steroids, Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Kuprevich 5/2, 220141 Minsk, Belarus
,
Maryia Barysevich
a   Tallinn University of Technology, School of Science, Department of Chemistry and Biotechnology, Akadeemia tee 15, 12618 Tallinn, Estonia   Email: dzmitry.kananovich@taltech.ee
b   Laboratory of Steroids, Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Kuprevich 5/2, 220141 Minsk, Belarus
,
Maksim Ošeka
a   Tallinn University of Technology, School of Science, Department of Chemistry and Biotechnology, Akadeemia tee 15, 12618 Tallinn, Estonia   Email: dzmitry.kananovich@taltech.ee
,
Jasper Adamson
c   National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
,
a   Tallinn University of Technology, School of Science, Department of Chemistry and Biotechnology, Akadeemia tee 15, 12618 Tallinn, Estonia   Email: dzmitry.kananovich@taltech.ee
› Author Affiliations
Funding from the European Union’s Seventh Framework Program for research, technological development and demonstration Grant No. 621364 (TUTIC-Green) and from Tallinn University of Technology (Grant No B58) is gratefully acknowledged. M.I. and M.B. are grateful to Dora Plus program for financial support of a short research stay at Tallinn University of Technology. J.A. acknowledges support by the ­Estonian Ministry of Education and Research through grant IUT23-7 and the EU European Regional Development Fund through grant TK134. Support from COST Action CA15106 ‘C–H Activation in Organic Synthesis’ (CHAOS) is gratefully acknowledged.
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Publication History

Received: 15 November 2018

Accepted after revision: 18 December 2018

Publication Date:
05 February 2019 (online)


Dedicated to Prof. Oleg Kulinkovich on the occasion of his 70th birthday

Abstract

Asymmetric Kulinkovich cyclopropanation of carboxylic ­esters with prochiral alkenes is reported. The process is mediated by ­titanium(IV) (4R,5R)-TADDOLate complexes and affords correspondingly (Z)- or (E)-cyclopropanols with up to 84–87% ee in the event of intra- or intermolecular olefin ligand exchange in intermediate titanacyclopropane [titanium(II)-alkene] species. Configuration of the olefin double bond is preserved in the cyclopropane products, pointing out on ­total retention of configuration at Ti–C bond in the cyclopropane forming step. The results have been interpreted in the framework of ate complex mechanism, suggesting formation of pentacoordinated titanium ate species as a prerequisite of high enantiocontrol.

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