Boric ester synthesis
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United States of America Patent
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Jan 21, 1997
Issued Date -
N/A
app pub date -
Jun 2, 1995
filing date -
Nov 25, 1992
priority date (Note) -
Expired
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Abstract
Stable .alpha.-substituted boronic esters, e.g. for use in peptide synthesis, are prepared by reacting a substituted alkene of the formula: ##STR1## with a disubstituted borane of the formula: ##STR2## wherein: (i) R.sup.1 and R.sup.2 are each selected from various groups which are preferably not leaving groups; (ii) X is halogen or other leaving group; (iii) Y is H or lower alkyl; (iv) Q.sup.1 and Q.sup.2 are each selected from various groups which are preferably such that the borane is non-hydrolyzable, and particularly Q.sup.1 and Q.sup.2 together may represent a residue of a diol such as catechol or pinanediol.
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