SummaryA facile and inexpensive synthesis of a series of novel methylenedioxy-bearing 2-(benzofuran-2-yl)-quinoline-3-carboxylic acid derivatives 3a–h via the one-pot reaction of ethyl 2-chloromethyl-6,7-methylenedioxyquinoline-3-carboxylate (5) with various substituted salicylaldehydes 6a–g as well as 2-hydroxy-1-naphthaldehyde (6h) is described. Substrate 5 was synthesized by the Friedländer condensation reaction of 2-amino-4,5-methylenedioxybenzaldehyde (4) with ethyl 4-chloro-3-oxobutanoate using KHSO4 as catalyst under ultrasound irradiation conditions. The targeted compounds 3a–h were obtained in good yields of 52–82% and their structures were established based on spectral data and elemental analyses.

A simple and concise approach for the synthesis of a series of new heterocyclic systems of 2‐(benzofuran‐2‐yl)benzo[h]quinoline‐3‐carboxylic acid derivatives (3a–3g) is described. The synthetic strategy features the one‐pot reaction of ethyl 2‐(chloromethyl)benzo[h]quinoline‐3‐carboxylate (2) with various substituted salicylaldehydes as well as 2‐hydroxy‐1‐naphthaldehyde as a key step. The substrate 2 was prepared in good yield by a mild, efficient and direct reaction of 1‐naphthylamine (1) with Vilsmeier‐Haack reagent. The structures of all the new compounds were identified by spectral data and elemental analysis.

The whole progress of construction project management from Low-carbon idea is studied in this paper. And we hope these research results make project manager agree on the low-carbon idea of the energy conservation mode and sustainable development mode. Then the future project products become the low-carbon products and become the sustainable development products.

The Friedel-Crafts acylation reaction between 5-cyanoindole and 4-chlorobutyryl chloride was conducted in ionic liquid 1-buty-3-methylimidazolium chloroaluminate ([bmiCl/AlCl3), the major product was 5-cyano-3-(4-chlorobuty) indole. The structure of the product was characterized by Mass and1H NMR spectra. When the molar ratio of AlCl3to [bmiCl in [bmiCl/AlCl3is at 1:1 or less, no 5-cyano-3-(4-chlorobuty) indole could be obtained. The suitable molar ratios of AlCl3to [bmiCl in [bmiCl/AlCl3were from 2:1 to 3:1, the yields of the major product were from 68% to 70%, respectively. When the molar ratio of [bmiCl/AlCl3to 5-cyanoindole was less than 2:1, the acylation reaction was difficult to carry out, because 5-cyanoindole would be not totally dissolve in [bmiCl/AlCl3under the situation.

Firstly, the characteristics and the application of the common project management modes at home and abroad are simply analyzed. Secondly, the common project contract texts at home and abroad are compared and analyzed. Then the construction project management modes based on the contract text are discussed. Hope the research conclusions can give people some help.