Total Synthesis of the Potent HIF-1 Inhibitory Antitumor Natural Product, (8R)-Mycothiazole, via Baldwin-Lee CsF/Cul sp(3)-sp(2)-Stille Cross-Coupling. Confirmation of the Crews Reassignment

摘要

A convenient asymmetric total synthesis of the potent HIF-1 inhibitory antitumor natural product, (-)- or (+)-(8R)-mycothiazole (1), is described. Not only does our synthesis confirm the 2006 structural reassignment made by Crews (Crews, P., et al. J. Nat. Prod. 2006, 69, 145), it revises the [a]p data previously reported for this molecule in MeOH from -13.7 degrees to +42.3 degrees. The newly developed route to (8R)-1 sets the C(8)-OH stereocenter via Sharpless AE/2,3-epoxy alcohol reductive ring opening and utilizes two Baldwin-Lee CsF/cat. CuI Stille cross-coupling reactions with vinylstannanes 8 and 3 to efficiently elaborate the C(1) C(4) and C(14) C(18) sectors.