A TiCl4 promoted formal [3 + 3] cycloaddition of cyclopropane 1,1-diesters with azides has been developed for the synthesis of highly functionalized triazinines. Both stoichiometric and substoichiometric versions of this reaction were accomplished dependent on the choice of solvent. It is noteworthy that the corresponding products could be easily converted to biologically important azetidines by simple thermolysis.

A catalytic [3+3] annulation of cyclopropane 1,1‐diesters with in‐situ‐generated mercaptoacetaldehyde for the synthesis of polyfunctionalized tetrahydrothiopyran derivatives has been developed. A ring‐opening/aldol cascade reaction catalysed by Sc(OTf)3 (10 mol‐%) gave a series of tetrahydrothiopyranols in good yields. Simple derivatization of the products gave some useful compounds.

Currently, data mining in data stream becomes a very popular research field. One of the central tasks in mining data streams is that of identifying outliers which can lead to discovering unexpected and interesting knowledge, which is critical important. To effectively mine outliers in data stream, ODABK, an algorithm for outlier detection in data stream is presented. It is based on KNN and significantly enhanced by means of other data structures and its optimized logical operations. Finally, the paper reports experiments on a real-world census data which show that ODABK is more effective in detection rate and execution times.

A Sc(OTf)3‐catalyzed formal [3 + 3] cycloaddition of cyclopropane dicarboxylates with mercaptoacetaldehyde is developed to produce tetrahydrothiopyranols in good yields.

TiCl 4 Promoted Formal [3 + 3] Cycloaddition of Cyclopropane 1,1-Diesters with Azides: Synthesis of Highly Functionalized Triazinines and Azetidines. -The first TiCl 4 promotes [3 + 3] cycloaddition of 2-substituted cyclopropane-1,1-diesters with azides to devise complex triazinines with diverse substituent patterns in good yields is developed. Both stoichiometric and substoichiometric versions of this reaction are accomplished dependent on the choice of solvent. -(ZHANG, H.-H.; LUO, Y.-C.; WANG, H.-P.; CHEN, W.; XU*, P.-F.; Org. Lett. 16 (2014) 18, 4896-4899, http://dx.