One-step convergent synthesis of the steroid ring system via the coupling of gamma,delta-unsaturated Fischer carbene complexes with o-ethynylbenzaldehyde
Bk. Ghorai et al., One-step convergent synthesis of the steroid ring system via the coupling of gamma,delta-unsaturated Fischer carbene complexes with o-ethynylbenzaldehyde, ORG LETT, 3(22), 2001, pp. 3535-3538
[GRAPHICS]
Simultaneous and stereoselective construction of the steroid B and C rings
is observed in a tandem process involving the coupling of o-ethynylbenzalde
hyde with 2-alkenylcyclopentylcarbene-chromium complexes.