Microwave enhanced syntheses of 9-boronobenzyladenine derivatives by the reaction of adenine with the corresponding bromomethylphenylboric acid were reported. Microwave irradiation reduced the overnight reaction time of conventional thermal methods to 10 min, provided the desired products and increased the yields up to three times. Preliminary in vitro pharmacological tests were also described.

Keywords: 9-boronobenzyladenines, anti-inflammatory, antitumor, microwave-asisted synthesis

★★★☆☆ Yu XJ,Liu W,Hu WD,et al. Microwave Assisted Synthesis And Biological Activities Of 9-boronobenzyladenine Derivatives[J]. Journal Of Chemical Research,2007:347-349.

The cucumber cotyledon greening bioassay for cytokinins was modified by using 95 % acetone-ethanol instead of 80 % acetone as extraction solvent. The cotyledons were extracted directly with a 2:1 (v/v) acetone-ethanol solution in dark for 24 hours, omit ting the homogenization and centrifugation operations of the previous bioassay. The modified bioassay is more convenient and especially useful in screening cytokinin-active substance from a large number of samples.

Key words: cytokinins, cu cum ber cot y le don greening bioassay, chlorophyll ex trac tion, 6-benzyl-adenine, N,N’-diphenylurea

★★★☆☆ Yu XJ, Li GX, Xu D,et al. An Im Provement Of Cucumber Cotyledon Greening Bioassay For Cytokinins[J]. Acta Physiologiae Plantarum,2006,28(1):9-11.

9-beta-D-Arabianofuranosyl guanine (6) and 2-amino-9-(beta-D-arabianofuranosyl)purine (8) were prepared from 2-amino-6-chloro-9-(2,3,5-triphenylmethoxyl-p-D-arabianofuranosyl)purine (4), a key intermediate which was stereoselectively prepared from 2,3,5-triphenylmethoxyl-D-arabianofuranose and 2-amino-6-chloro-purine. The yield of the intermediate was obviously improved and only P-isomer was formed by using the activated molecular sieve as environmental friendly catalyst, overcoming the defect that a 1: 1 mixture of alpha- and beta-isomers was formed, which was difficult to separate, when toxic mercury cyanide was previously used as catalyst.

★★★☆☆ X.-J. Yu et al. / Bioorg. Med. Chem. Lett. 15 (2005) 683–685.