Abstract
Carbohydrate functionalized 2-oxacyclopentylidene complexes of chromium and tungsten 5a/b - 8c/d are synthesized by cycloisomerization of butynols 1a/b - 4a/b at a pentacarbonylmetal template. Their α-CH-acidity is exploited to generate compounds 9a and 10a bearing exo -alkylidene groups. Ring-opening aminolysis of 7a leads to aminocarbene complex 11a which - under Mitsunobu conditions - undergoes cyclization to give chromium azacyclopentylidene 12a . Sugar modified oxacyclopentylidene complexes are synthesized by cycloisomerization of butynols at a pentacarbonylmetal template and are exploited in a novel access to 2-azacyclopentylidene complexes.
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