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  _____      ___      ______     ___      ______  
 / ____||   / _ \\   /_   _//   / _ \\   /_   _// 
/ //---`'  / //\ \\    | ||    | / \ ||  `-| |,-  
\ \\___   |  ___  ||  _| ||    | \_/ ||    | ||   
 \_____|| |_||  |_|| /__//      \___//     |_||   
  `----`  `-`   `-`  `--`       `---`      `-`'

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Text this: A variation of the Pictet-Spengler reaction via a sequential reduction-cyclization reaction of N-acylcarbamates: synthesis of 1-substituted tetrahydroisoquinoline derivatives