Squarylium compounds, and processes and intermediates for the synthesis of these compounds
申请人:Polaroid Corporation
公开号:US06482950B1
公开(公告)日:2002-11-19
Squarylium compounds of the formula:
wherein Q1 and Q2 are each independently a pyrylium, thiopyrylium, selenopyrylium, benzpyrylium, benzthiopyrylium or benzselenopyrylium nucleus, and R1 and R2 are each independently an aliphatic or cycloaliphatic group, can be prepared by reacting a squaric acid derivative of the formula:
with a compound of the formula Q2CH2R2 in the presence of a base. The derivatives of Formula II may be prepared by condensing a 2,3,4,4-tetrahalocyclobut-2-en-1-one with a compound of the formula Q1CH2R1 in the presence of a base to produce a compound of the formula:
wherein Q1 and R1 are as defined above, and X represents chlorine or bromine, and hydrolyzing the compound of Formula III. Alternatively, the derivatives of Formula II may be prepared by reacting a diester, monoacid chloride monoester or diacid chloride of squaric acid with a compound of the formula Q1CH2R1 in the presence of a base, followed by hydrolysis of the resultant monoacid chloride or monoester derivative of the compound of Formula II to the parent compound.
化合物的公式为Squarylium:其中Q1和Q2分别独立地为吡啶、硫代吡啶、硒代吡啶、苯基吡啶、苯基硫代吡啶或苯基硒代吡啶核,R1和R2分别独立地为脂肪基或环状脂肪基。可以通过在碱存在下将公式为的Squaric酸衍生物与公式为Q2CH2R2的化合物反应来制备公式为的Squarylium化合物。公式II的衍生物可通过在碱存在下将2,3,4,4-四卤代环丁-2-烯-1-酮与公式为Q1CH2R1的化合物缩合来制备,从而产生公式为的化合物:其中Q1和R1如上定义,X代表氯或溴,并水解公式III的化合物。或者,公式II的衍生物可以通过在碱存在下将Squaric酸的二酯、单酸氯单酯或二酸氯与公式为Q1CH2R1的化合物反应,随后水解化合物II的单酸氯或单酯衍生物以得到母体化合物。