Amino alcohols cyclic boronates

Many heterocyclic compounds used as auxiliaries or catalysts have already been treated in preceding sections (e.g., alkaloids, derivatives of proline, cyclic derivatives of amino alcohols and hydroxy acids, etc.). This section deals with some special types of heterocyclic compounds which contain either only oxygen functions, or boron. 

In principle, any difunctional chiral compound, such as a diol, diamine, or amino alcohol, can form a cyclic boron derivative by reaction with borane, haloboronic acid or its esters, alkylboronic acids, trihaloboranes or similar compounds. Several syntheses of this type are described in chapters D.1.3.3.3. (together with applications for allylic additions to carbonyl compounds) and D. 1.1.2.1. (with applications of a-haloboronic acids). 

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