Stereospecific Photochemical Cyclization of Azidoquinone withE,E- andZ,Z-Dienes. Application to the Synthesis of an Important Precursor toward Mitomycins
Stereospecific Photochemical Cyclization of Azidoquinone withE,E- andZ,Z-Dienes. Application to the Synthesis of an Important Precursor toward Mitomycins
Photochemical reaction of 2-azido-1,4-quinones (1)–(3) with conjugateddienes (4)–(6) gives the corresponding 2-alkenyl-2,3-dihydroindoloquinones (7)–(14) with complete preservation of the original stereochemistry in their alkenyl moiety.