Synthesis of 9-[cis-3-(hydroxymethyl)cyclobutyl]-adenine and -guanine
摘要:
2,2-Dichloro-3-(benzyloxymethyl)cyclobutanone 15, which was prepared in 50% yield by the cycloaddition of dichloroketene to allyl benzyl ether 14, was converted in four steps and in similar to 40% overall yield into trans-3-(benzyloxymethyl)cyclobutanol 11b. The latter alcohol 11b was coupled under Mitsunobu conditions with 6-(4-chlorophenylsulfanyl)-9H-purine 21b and 6-(4-chlorophenylsulfanyl)-2-(phenylacetamido)-9H-purine 21c to give the 9-cyclobutylpurine derivatives 22 and 24, respectively, in 88 and 60% yield. The former product 22 was converted in three steps and in 39% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl]adenine 6, and the latter product was converted in four steps and in 42% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl] guanine 7. X-Ray crystallographic data relating to compounds 22 and 24 are also reported.
Synthesis of 9-[cis-3-(hydroxymethyl)cyclobutyl]-adenine and -guanine
摘要:
2,2-Dichloro-3-(benzyloxymethyl)cyclobutanone 15, which was prepared in 50% yield by the cycloaddition of dichloroketene to allyl benzyl ether 14, was converted in four steps and in similar to 40% overall yield into trans-3-(benzyloxymethyl)cyclobutanol 11b. The latter alcohol 11b was coupled under Mitsunobu conditions with 6-(4-chlorophenylsulfanyl)-9H-purine 21b and 6-(4-chlorophenylsulfanyl)-2-(phenylacetamido)-9H-purine 21c to give the 9-cyclobutylpurine derivatives 22 and 24, respectively, in 88 and 60% yield. The former product 22 was converted in three steps and in 39% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl]adenine 6, and the latter product was converted in four steps and in 42% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl] guanine 7. X-Ray crystallographic data relating to compounds 22 and 24 are also reported.
Pd/PTABS: Low-Temperature Thioetherification of Chloro(hetero)arenes
作者:Siva Sankar Murthy Bandaru、Shatrughn Bhilare、Jesvita Cardozo、Nicolas Chrysochos、Carola Schulzke、Yogesh S. Sanghvi、Krishna Chaitanya Gunturu、Anant R. Kapdi
DOI:10.1021/acs.joc.9b00840
日期:2019.7.19
Heteroarenes of commercial relevance such as purines and pyrimidines were also found to be useful substrates for the reported transformation. The commercial drug Imuran (azathioprine) was synthesized as an example, and its preparation could be optimized. DFT studies were performed to understand the electronic effects of the tested ligands on the catalytic reaction.
Cross-Dehydrogenative Coupling of Azoarenes with Dialkyl Disulfides
作者:Peng Qi、Fang Sun、Ning Chen、Hongguang Du
DOI:10.1021/acs.joc.0c00953
日期:2020.7.2
A catalyst-free cross-dehydrogenative coupling reaction of purines and some azoarenes with dialkyl disulfides has been developed. This procedure provided a novel strategy to construct unsymmetrical disulfides through the α-heterocyclic functionalization of symmetrical dialkyl disulfides. The S–S bond was successfully tolerated in this transformation. The mild conditions and the broad scope of azoarenes
Antimycobacterial Agents. 1. Thio Analogues of Purine
作者:Ashish K. Pathak、Vibha Pathak、Lainne E. Seitz、William J. Suling、Robert C. Reynolds
DOI:10.1021/jm030389b
日期:2004.1.1
Thio analogues of purine, pyridine, and pyrimidine were prepared based on the initial activity screening of several analogues of these heterocycles against Mycobacterium tuberculosis (Mtb). Certain 6-thio-substituted purine analogues described herein showed moderate to good inhibitory activity. In particular, two purine analogues 9-(ethylcarboxymethyl)-6-(decylthio)9H-purine (20) and 9-(ethylcarboxymethyl)-6-(dodecylthio)-9H-purine (21) exhibited MIC values of 1.56 and 0.78 mug/mL respectively against the Mtb H(37)Rv strain. N-9-Substitution apparently enhances the antimycobacterial activity in the purine series described herein.
HFIP Promoted Low-Temperature S<sub>N</sub>Ar of Chloroheteroarenes Using Thiols and Amines
作者:Yuvraj B. Bhujabal、Kamlesh S. Vadagaonkar、Aniket Gholap、Yogesh S. Sanghvi、Rambabu Dandela、Anant R. Kapdi
DOI:10.1021/acs.joc.9b02371
日期:2019.12.6
A highly efficient and an unprecedented hexafluoro-2-propanol, promoting low-temperature aromatic nucleophilic substitutions of chloroheteroarenes, has been performed using thiols and (secondary) amines under base free and metal-free conditions. The developed protocol also provides excellent regio-control for the selective functionalization of dichloroheteroarenes, while the utility of the protocol was demonstrated by the modification of a commercially available drug ceritinib.
Synthesis of 9-[cis-3-(hydroxymethyl)cyclobutyl]-adenine and -guanine
作者:Vijay Kaiwar、Colin B. Reese、Emily J. Gray、Stephen Neidle
DOI:10.1039/p19950002281
日期:——
2,2-Dichloro-3-(benzyloxymethyl)cyclobutanone 15, which was prepared in 50% yield by the cycloaddition of dichloroketene to allyl benzyl ether 14, was converted in four steps and in similar to 40% overall yield into trans-3-(benzyloxymethyl)cyclobutanol 11b. The latter alcohol 11b was coupled under Mitsunobu conditions with 6-(4-chlorophenylsulfanyl)-9H-purine 21b and 6-(4-chlorophenylsulfanyl)-2-(phenylacetamido)-9H-purine 21c to give the 9-cyclobutylpurine derivatives 22 and 24, respectively, in 88 and 60% yield. The former product 22 was converted in three steps and in 39% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl]adenine 6, and the latter product was converted in four steps and in 42% overall yield into 9-[cis-3-(hydroxymethyl)cyclobutyl] guanine 7. X-Ray crystallographic data relating to compounds 22 and 24 are also reported.