Approaching the C33-C38 Fragments of Amphotericin B and Nystatin by a Retro-[1,4]-Brook Rearrangement and the Stereoselective Manipulation of the Resulting Allylsilane
Approaching the C33-C38 Fragments of Amphotericin B and Nystatin by a Retro-[1,4]-Brook Rearrangement and the Stereoselective Manipulation of the Resulting Allylsilane
species which underwent an irreversible retro-[1,4]-Brookrearrangement giving rise to a 22:78 mixture of the anti,trans and the syn,trans diastereomer of the tiglyl silane 6. The same sulfide 5 and potassium naphthalenide provided the same products anti,trans- and syn,trans- 6 as a 96:4 mixture. This time they arose from the reversible retro-[1,4]-Brookrearrangement of a tiglyl potassium intermediate