Radical Cyclization in Heterocycle Synthesis. 12. Sulfanyl Radical Addition-Addition-Cyclization (SRAAC) of Unbranched Diynes and Its Application to the Synthesis of A-Ring Fragment of 1.ALPHA.,25-Dihydroxyvitamin D3.
Radical Cyclization in Heterocycle Synthesis. 12. Sulfanyl Radical Addition-Addition-Cyclization (SRAAC) of Unbranched Diynes and Its Application to the Synthesis of A-Ring Fragment of 1.ALPHA.,25-Dihydroxyvitamin D3.