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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:区域选择性合成4-氯-2-噻吩羧酸
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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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