Conjugate addition-aldol approach to the simple bicyclic-diynene core structure found in the esperamicins and calicheamicins
摘要:
The stable 12-beta-hydroxybicyclo[7.1.0] diynene core 15 has been prepared stereospecifically. The key step consists of conjugate addition of dimethylaluminum benzenethiolate to enone aldehyde 12 followed by an in situ titanium isopropoxide assisted aldol cyclization to produce alcohol 13 as a single isomer.
Conjugate addition-aldol approach to the simple bicyclic-diynene core structure found in the esperamicins and calicheamicins
摘要:
The stable 12-beta-hydroxybicyclo[7.1.0] diynene core 15 has been prepared stereospecifically. The key step consists of conjugate addition of dimethylaluminum benzenethiolate to enone aldehyde 12 followed by an in situ titanium isopropoxide assisted aldol cyclization to produce alcohol 13 as a single isomer.