A. Yamashita

Synthesis of indenes from alkynes and phenyl amino chromium carbene complexes

Abstract Reactions of phenyl morpholino or pyrrolidino chromium carbene complexes with alkynes in DMF at 120–125°C resulted in exclusive formation of the indene derivatives.

Regioselectivity of the reaction of a chromium-carbene complex with alkynes: Examination of steric and electronic factors

Abstract Examination of a steric and electronic factor of alkyne in regioselectivity in the reaction of a phenyl chromium carbene complex with unsymmetrical alkynes is described.

Reaction of aryl chromium carbene complexes with ethyl propiolate a versatile vinyl ether formation

Abstract Arylmethoxychromium-carbene complexes reacted with ethyl propiolate in the presence of alcohol to form and yields of aryl vinyl ether derivatives of malonate.

Reaction of a pyrrole-carbene chromium complex with alkynes: a facile hydroindoloquinone formation with in-situ protection.

Abstract Cycloaddition reaction of a pyrrole-carbene chromium complex with alkyne in the presence of acetic anhydride and triethylamine provided the acetylated hydroindoloquinone derivative.

Synthesis of cyclopentanones via reaction of furan chromium carbene complexes with alkynes

Abstract Reactions of the furan-methoxy chromium carbene complexes with alkynes in DMF at 120°C provided cyclopentafurans, which served as useful precursors for cyclopentanones and other ring systems.

Reaction of aryl chromium carbene complexes with 1-hexyne; formation of unusual diels-alder cycloaddition products

Abstract The reaction of an aryl chromium carbene complex with 1-hexyne provided a benzannulated product as a major component along with unusual Diels-Alder cycloaddition products.

Reactions of aryl chromium carbene complexes with alkoxalkyne: O-Quinonemethide formation and unusual diels-alder dimerization

Abstract Reactions of a pyrrole- and a phenyl-carbene chromium complexes with 3-alkoxy-1-ethoxy-1-butyne produced dimers through o-quinone-methide formation from the alkyne-carbene cycloaddition products and subsequent Diels-Alder dimerization.