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REGIOSELECTIVE SYNTHESIS OF 4-CHLORO-2-THIOPHENECARBOXYLIC ACID.
REGIOSELECTIVE SYNTHESIS OF 4-CHLORO-2-THIOPHENECARBOXYLIC ACID.
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机译:4-氯-2-硫代羧酸的区域选择性合成。
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PCT No. PCT/US93/08613 Sec. 371 Date Jul. 7, 1995 Sec. 102(e) Date Jul. 7, 1995 PCT Filed Sep. 17, 1993 PCT Pub. No. WO94/12505 PCT Pub. Date Jun. 9, 19944-Chloro-2-thiophenecarboxylic acid is made by forming a compound of formula (Ia), disclosed herein, wherein R3 is (C1-C6) alkyl, phenyl, or benzyl; converting the compound to a compound of formula (IVa), disclosed herein, and removing the silyl group R3Si-. The product is useful as an intermediate in making pharmaceutical products.
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