Demonstration of spontaneous chiral symmetry breaking in asymmetric Mannich and Aldol reactions.

Abstract:

:Spontaneous symmetry breaking in reactive systems, known as a rare physical phenomenon and for the Soai autocatalytic irreversible reaction, might in principle also occur in other, more common asymmetric reactions when the chiral product is capable to promote its formation and an element of "nonlinearity" is involved in the reaction scheme. Such phenomena are long sought after in chemistry as a possible explanation for the biological homochirality of biomolecules. We have investigated homogeneous organic stereoselective Mannich and Aldol reactions, in which the product is capable to form H-bridged complexes with the prochiral educt, and found by applying NMR spectroscopy, HPLC analysis, and optical rotation measurements 0.3-50.8% of random product enantiomeric excess under essentially achiral reaction conditions. These findings imply a hitherto overlooked mechanism for spontaneous symmetry breaking and, hence, a novel approach to the problem of absolute asymmetric synthesis and could have also potential significance for the conundrum of homochirality.

journal_name

Chirality

journal_title

Chirality

authors

Mauksch M,Tsogoeva SB,Wei S,Martynova IM

doi

10.1002/chir.20474

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

816-25

issue

10

eissn

0899-0042

issn

1520-636X

journal_volume

19

pub_type

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