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Two new and efficient synthetic routes towards substituted 4H-1,4-benzoxazine derivatives were reported. The first one involves the synthesis in four steps of the 4-Boc-4H-1,4-benzoxazine and its regioselective substitution on C-3 following a lithiation–electrophilic substitution sequence. The second route involves palladium-catalyzed coupling reactions between organostannanes and a vinylphosphate obtained from a benzoxazin-3-one derivative.

In view of their potential biological properties, different substituted dibenzo [b,e][1,4] dioxins have been synthesized using Diels-Alder reactions. This required the preparation of furobenzodioxins and further dehydration of the bicyclo-adducts of the cycloaddition.

An efficient synthesis of silanediol-based transition-state inhibitors of proteases is described. A new convergent synthesis has been optimized by using a two-step sequence of hydrosilylation followed by the addition of a silyllithio species to an imine. The method should be applicable to the synthesis of a wide variety of silanediol isosteres to probe the utility of this unique transition-state isostere.

Here is described a high yield synthesis of 3-substituted 4 H-1,4-benzoxazines viapalladium-catalysed coupling reactions between organostannanes and a vinylphosphate obtained from a benzoxazin-3-one derivative.

Various 3-substituted-4 H-1,4-benzoxazines were prepared in good yields by lithiation-electrophilic substitution of the 4-Boc-4 H-1,4-benzoxazine. The synthesis of this carbamic derivative, in four steps from 2-aminophenol, was described.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.