TBAF tetrahydrofuran → 17-(4-Ethyl-4-hydroxyhexylthiomethyl)-1alpha,3beta-dihydroxyandrosta-5,7,16-triene
Reaction equation
[Si]([O:8][C@@H:9]1[C@@:26]2([CH3:27])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:25]2[CH2:24][CH2:23][C@@:21]2([CH3:22])[C@H:17]3[CH2:18][CH:19]=[C:20]2[CH2:28][S:29][CH2:30][CH2:31][CH2:32][C:33]([CH2:44][CH3:45])([O:36][Si](CC)(CC)CC)[CH2:34][CH3:35])[CH2:12][C@@H:11]([O:46][Si](C(C)(C)C)(C)C)[CH2:10]1)(C(C)(C)C)(C)C.O1CCCC1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>>[CH2:34]([C:33]([OH:36])([CH2:44][CH3:45])[CH2:32][CH2:31][CH2:30][S:29][CH2:28][C:20]1[C@:21]2([CH2:23][CH2:24][C@H:25]3[C:16](=[CH:15][CH:14]=[C:13]4[C@:26]3([CH3:27])[C@@H:9]([OH:8])[CH2:10][C@H:11]([OH:46])[CH2:12]4)[C@@H:17]2[CH2:18][CH:19]=1)[CH3:22])[CH3:35]Participants
3
Procedure
1α,3β-Bis(tert-butyldimethylsilyloxy)-17-{4-ethyl-4-(triethylsilyloxy)hexylthiomethyl}androsta-5,7,16-triene (310 mg, 0.386 mmol) and a 1M tetra-n-butylammonium fluoride tetrahydrofuran solution (5 ml) were subjected to reaction using a procedure similar to that of Example 5(2) (3 hours), worked up and purified by column chromatography (ethyl acetate) to give the titled compound (136 mg, 77%) as a colorless foam.