摘要:
A process for making an amino acid by the steps of: (a) contacting a compound of formula I with a hydroformylation catalyst and synthesis gas to produce a mixture of aldehyde compounds comprising the formulas IIa, IIb and IIc; (b) reacting the mixture of aldehyde compounds from step (a) to produce a mixture of derivative compounds; (c) contacting the mixture of derivative compounds from step (b) with an enantioselective hydrolase enzyme in the presence of water to produce an L-amino acid having the formula IV; (d) isolating the amino acid having the formula IV in substantially pure form, wherein in formulas I, IIa, IIb, IIc, IIIa, IIIb, IIIc and IV, R is H, alkyl or aryl and R1 and R2 are the same or different alkyl groups and wherein R1 and R2 may be fused
摘要翻译:通过以下步骤制备氨基酸的方法:(a)使式I化合物与加氢甲酰化催化剂和合成气接触以产生包含式IIa,IIb和IIc的醛化合物的混合物; (b)使来自步骤(a)的醛化合物的混合物反应以产生衍生化合物的混合物; (c)在水存在下将来自步骤(b)的衍生化合物的混合物与对映选择性水解酶接触以产生具有式IV的L-氨基酸; (d)以基本上纯的形式分离具有式IV的氨基酸,其中在式I,IIa,IIb,IIc,IIIa,IIIb,IIIc和IV中,R是H,烷基或芳基和R 1, SO 2和R 2是相同或不同的烷基,其中R 1和R 2可以是稠合的
摘要:
The invention relates to an improved process for the preparation of an advanced synthetic intermediate of ACE inhibitors. In one aspect, the present invention is based on a novel process for the preparation of an aldehyde of formula (I), wherein (N)PrG is a protected amino group, R is an alkyl or aralkyl group and X1-4 are each independently H or a non-reacting substituent, which comprises hydroformylation of an α-olefin of formula (II), by reaction with syngas (CO/H2) in the presence of, as catalyst, a group VIII transition metal complex of a phosphorus-containing ligand. Aldehyde (I), the product of linear hydroformylation, is formed in preference to aldehyde (III). In another aspect of the invention, α-olefin (II) is a novel composition. The process to convert (II) to (I) enables an efficient manufacturing route to MDL 28,726 and analogues.
摘要:
A substituted polyethylene glycol compound and process for making. The compound has the formula RO(C2H4O)nH wherein R represents a C1-7 hydrocarbon group and n represents the average number of moles of C2H4O groups, ranging from 500 to 2000. The compound has a ratio of weight average molecular weight to a number average molecular weight in the range of from 1 to 1.1. The compound contains less than ten weight percent polyethylene glycol. The gist of the process is the use of an aprotic polar solvent. When the aprotic polar solvent is a polyether solvent, then the n value of the compound ranges from 100 to 2000.
摘要翻译:取代的聚乙二醇化合物及其制备方法。 化合物具有式RO(C 2 H 4 O)n H H其中R表示C 1-7 - >烃基,n表示C 2 H 4 H 4 O基团的平均摩尔数,范围为500-2000。化合物的重均分子量与 数均分子量在1至1.1的范围内。 该化合物含有少于10重量%的聚乙二醇。 该过程的要点是使用非质子极性溶剂。 当非质子极性溶剂是聚醚溶剂时,化合物的n值范围为100-2000。
摘要:
The invention is directed toward novel high molecular weight and high purity mPEG alcohol compositions as well as a process for obtaining said compositions by removing PEG diols from the mPEG alcohol after polymerization is complete.
摘要:
The present invention provides a method for producing an enantiomerically enriched α-(phenoxy)phenylacetic acid compound of the formula: from its enantiomeric mixture, where R1 is alkyl or haloalkyl and X is halide.
摘要:
The present invention provides a method for producing an enantiomerically enriched α-(phenoxy)phenylactic acid compound of the formula: from its enantiomeric mixture, where R1 is alkyl or haloalkyl and X is halide.
摘要:
A substituted polyethylene glycol compound and process for making. The compound has the formula RO(C2H4O)nH wherein R represents a C1-7 hydrocarbon group and n represents the average number of moles of C2H4O groups, ranging from 500 to 2000. The compound has a ratio of weight average molecular weight to a number average molecular weight in the range of from 1 to 1.1. The compound contains less than ten weight percent polyethylene glycol. The gist of the process is the use of an aprotic polar solvent. When the aprotic polar solvent is a polyether solvent, then the n value of the compound ranges from 100 to 2000.
摘要翻译:取代的聚乙二醇化合物及其制备方法。 化合物具有式RO(C 2 H 4 O)n H H其中R表示C 1-7 - >烃基,n表示C 2 H 4 H 4 O基团的平均摩尔数,范围为500-2000。化合物的重均分子量与 数均分子量在1至1.1的范围内。 该化合物含有少于10重量%的聚乙二醇。 该过程的要点是使用非质子极性溶剂。 当非质子极性溶剂是聚醚溶剂时,化合物的n值范围为100-2000。