{'fraction_non_alphanumeric': 0.03374233128834356, 'fraction_numerical': 0.010736196319018405, 'mean_word_length': 5.465346534653466, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Metal-Free Double Csp2-H Bond Functionalization: Strategy for Synthesizing Benzo[ a]carbazoles from 2-Arylindoles and Acetophenones/Alkynes.

A metal-free strategy for the synthesis of benzocarbazoles from 2-arylindoles and aryl ketones is developed. Various 2-aryl-3-vinyl-indoles were generated in situ through dehydrative condensation of aryl ketones and indoles. These key intermediates could be selectively converted into the corresponding benzo[ a]carbazoles via a direct cyclization process between two Csp2-H bonds. Furthermore, terminal alkynes also could be used as the versatile C2 source to afford the corresponding products in good yields.