The structure and function of oestrogens. IV. Synthesis of 17α-ethynyloestradiol specifically polydeuterated in ring C
- 1 January 1983
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Chemistry
- Vol. 36 (2), 339-360
- https://doi.org/10.1071/ch9830339
Abstract
Epoxidation of 17,17-ethylenedioxy-3-methoxyoestra-1,3,5(10),9(11)-tetraene( 5) by a two-phase procedure gave the labile 9α,11α-epoxide (11), treatment of which with lithium perchlorate in benzene gave 17,17-ethylenedioxy-3-methoxy-97#946;-oestra-1,3,5(10)-trien-11-one (7). Deuteration of this by prolonged treatment with the monosodium salt of (O,O'-2H2)hydroquinone in dry (O-2H)methanol gave mainly the 98,12,12-trideutero ketone (24) (92% 2H3). Reduction of this with lithium aluminium deuteride to a mixture of the 11-epimeric alcohols (27a) followed by dehydration gave 17,17-ethylenedioxy- 3-methoxy(l1,12,12-2H3)oestra-1,3,5(10),9(11)-tetraene (26) which upon reduction with lithium/ammonia gave 17,17-ethylenedioxy-3-methoxy(11ζ,12,12-2H3)oestra-1,3,5(10)-triene (25). Hydrolysis and demethylation of (25) followed by treatment with potassium acetylide in liquid ammonia yielded 3,17-dihydroxy-19-nor-17a-(11ζ, 12, 12-2H3)pregna-1 ,3,5(10)-trien-20-yne (29) (2H4, 9.2; 2H3, 84.1; 2H3, 3.1; 2H1, 2.2; 2H0, 1.3%). Reduction of the trideutero 9(11)-ene (26) with hexadeuterodiborane followed by treatment with alkaline hydrogen peroxide afforded 17,17-ethylenedioxy-3-methoxy(9α,11β,12,12-2H4)oestra- 1,3,5(10)-trien-11α-ol (30a). Reduction of the corresponding tosylate (30b) with lithium aluminium deuteride, then hydrolysis, demethylation and ethynylation gave 3,17-dihydroxy-19-nor-17α- (9,l 1,11,12,12-2H5)pregna-1,3,5(10)-trien-20-yne (35) (2H5, 84.5; 2H4, 8.5; 2H3, 4.4; 2H2, 0.9; 2H1, 0.8; 2H0, 0.9%).Keywords
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